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For a general overview, look here:
http://www.cryptnet.net/fdp/crypto/keysigning_party/en/keysigning_party.htmlImage Removed

For PGP: http://www.pgp.com/index.htmlImage Removed
PGP is the commercial version and comes with a nice GUI.

For GPG: http://www.gnupg.orgImage Removed
GPG is a GNU version of PGP and interoperates nicely.

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Here is a decent public key server to use:
        http://pgp.mit.edu/Image Removed

You can use the pgp.mit.edu to look up my public key as an example.
Simply type in "Stephen.lau@ucsf.edu" in the search field. Select
verbose index and you will see that my key has been signed by
multiple people.

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